I don't know of any others either. However, some 4x4 explorere (maybe all, I'm not 100% sure) had 31 spline carriers. So that COULD be a cheap upgrade if you have to buy axles anyway.
the rear center sections on 4x4 solid axle explorers/mountaineers should be 31 spline trac-loc. axles are all different, but its a cheap way to get a diff.